I found the following tip on the Karate wiki that I wanted to use to get the unreachableUrl entry on a navigated page.
https://intuit.github.io/karate/examples/ui-test/#devtools-protocol-tips
When I run the command below I get an error about a cast. I copied the sample exactly so I'm lost as to what the issue may be.
javascript evaluation failed: driver.send({ method: 'Page.getFrameTree' }), Cannot cast jdk.nashorn.internal.scripts.JO4 to com.intuit.karate.driver.DevToolsMessage